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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7414b18f9c97f580bd72f3b318051381133af640c466b292e50781df61f92f74' 
  AND token = 'CeLI/TvHRwU5hHiuX1nDkf4ylPU7jGkCX5xi0JUoc2E=' 
  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"
    }
  }
}