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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca7deac38379c3403c770c6428924a1c5e489a0adb8ec8a1b4a0efbfb7ba8d5d' 
  AND token = 'U4Vd6bFDTCmV3G7Ide3GSuTXzf8ugquLroHE0s5z408=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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