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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1339fc045dce0b8d6504c70d1ec2b47db895bba952b278633527121dffbaf02' 
  AND token = 'qtqt6KTx16dr2nw+Y4GumA3PHy3h8ISFtb59O6eZa14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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