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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b104e19d4ffab2d61bdec4efeb2cabdd0fff879e37c50301d3a3e1dbb4e3b88e' 
  AND token = '7lNJF/sUfv3/zVD6BnnhvCn0plWIH76iz+wxbmmdpew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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