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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f18f5ec6bd7c43ef4962da52e0747de2283112a12960c921706ad939dadc735' 
  AND token = '/DUDMapZixSMFo2pwk1KHb3QE4n3Bq3pRpNO3SS+n6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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