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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b714775752335f2e95b526b26fc385139a3e34f6485eecd4098b1037ebab7bc' 
  AND token = 'jnQXcm8BlY36SnRvTJbrfdYL/eBPXicSor/hseF4bE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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