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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbcbdc1d62e6da4e99fbcbda371305e3feefc6e25fa9bc772cf3e4e20ac32357' 
  AND token = 'RUj4bXJ0ZC1xPTJPvpYtQLm5D36cSelwVDYmHh+dZ3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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