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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '175625ec04f0427d62416b8fca2f8fad3cec139a282dfd41346765754cb33c8a' 
  AND token = 'Xn6NFHa5eUUsrpxpmHO29V7UTGkcaSeu9utSKJwPSM0=' 
  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"
    }
  }
}