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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2697052509e667577fb50932b1c2450a7860938b93ace6b2274f8e3359063a4' 
  AND token = '1o/rglEFPQ51qUkCuKUVItixTeQxU327Cythk2Su9dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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