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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ad2d5fe88c6158f3578f6d8cd7e3cb7ac059567d7d424d8c4b06f6a95460ae' 
  AND token = 'JmYdM//QnilmA5kPr/JIHBQa+JyGWGAugEj8F8f5hzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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