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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29208235283dd39d9a0f2fcfe6b2c502b224916438e176de30dc65c664f8c4a0' 
  AND token = 'q6s15N+yl8limD0ktpf6oTPq4DcEun5WsxCVST7ugag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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