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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7af4cc4167db3a65c6eb8cad9e8f5701c7eb15cacfd997113671f672baacbd3c' 
  AND token = '6wWHoXDRS+uy24ckbqhc6wEaeB/jB/aQ5V28d3J1/T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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