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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a2abeca12c10523a6fd9d38b48d651bdc3862e51889fc76a2cf16e4802e62e' 
  AND token = 'zMRXDrkI/7f67DMq3gpdPqNVrnfmYyEdPt5xNWIRj5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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