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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1f8bb19ca23bea95aa53a10b8c3d5240048a812789d2d1c5930b54df7575e36' 
  AND token = '3QHZKPVPbRcnrRWSRsJbacPWaatyM0jZPd7tfMuY70c=' 
  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"
    }
  }
}