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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05b80f72d4ffd07465b5b6ab04534b905206d82a38c2cabba489afaad50e82e3' 
  AND token = 'K0Hq4P44jyQvgUSH0o5j/YdpcF3V1LlCxQBrK7cuG6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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