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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833e8aed882550050bd216809e0e5c929624bfb5fbb3bd400ded7ac2e7b10594' 
  AND token = 'vCX9PmBt4QxypZXa6a5v98b/CL5DVAoE+pzQFdLtClE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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