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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb0265997f9e4146e1cc34ce4d3132d9ef17916b3fd60fe69b7f2a3e20d6278' 
  AND token = 'fwTlXqyn3qXqLfrKjC/x664ZJZzJtsfU8jskF+Td3eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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