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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d66e1826e61c9f0acee14e3894e6a1951cf3740f2585ba309012a17c550514' 
  AND token = '2B2DClQ3V+ZNgWpG3T5Tu2sz1OGicRqSm7Ef8hpTna8=' 
  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"
    }
  }
}