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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e187bdfe727a9f2bcd8cbd6143c4d580c65055167543a8526de39a798654a48' 
  AND token = 'PTNYpvBhh4MnnL+asgwc4HG51Yi8n227iv9YmYefOyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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