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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecc8c11606a8aa4d72dfc77e0d00a185c51f153a050e937cf098ef221232fc92' 
  AND token = 'alMwl0iVS3Af/p09Pv4AY3FXqWq4pW5qkk+D09YDfRY=' 
  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"
    }
  }
}