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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ce724fa57660d7052f9c5dc41eebae619d97c0e9e377449b3b7c82d00bfa76e' 
  AND token = '/s8Te8lB1ny59Zjq31hB4QdeyOLhQsHRexNW4Y0Txy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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