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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b437eb5768da775520f37c2b040ad7dbcf5b913c4796ef8795c32768c7d52e' 
  AND token = 'u7qqQ/u64uo8tqm5Ya7PJpgon8v1XsZ8N6hUvhFTYTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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