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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ab209f5e67f31ec6d299d3f4ea23ac8dccbec0497c5e0ee46021b875556e6d0' 
  AND token = 'LwPcHWcUwjpgsGbNlJoSVkiiyz4Bu58UzMrn1zwfTT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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