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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4132a89b6a1e9f85b1e30cf63f559f82e2b6641baaeac488a0179c39432ac91' 
  AND token = 'CtmzM+Lp/L64pXvyuw+gpjm+HW4yL3FXwxuvyk1XvwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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