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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ccd118b1e7aa795af9484b35a28012c49b3d11ab12a73354741f7639c20288' 
  AND token = '4UxjCrkdEbq2cU3W3CG6JglpNXcPqrWcQAWY5Ib7LkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00103

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}