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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea7e5c22f17821b16ebf7f8f9f1ec82e573b0380f191c235204bd65c6bc37d57' 
  AND token = 'TB2f8gWRdw6T+7X+dKp2OW+un3Gr4RaRyBoc98CUQGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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