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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62550beb182a4444f05b1fa6621bf58c1d9b220ae28cc6c6795284c13fa84207' 
  AND token = 'llu8iO9udRq825azZ4du43zYF5djWBzxmb8/Cd+1Z1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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