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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2429f89a5c8edd8e409d0503ddc7f59f04fe4678d18db492d2ddffd71f7375' 
  AND token = 'iSqwTBrFNh2Q++D6Pg0wop5/h1YFViWYWXdmQmIRMv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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