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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41d79bbfaf4abd844b29ac3d64e0796acc719f20b08e4c602aae70e1451ad17e' 
  AND token = 'n8O0ZUKkrOjfPsFQ2O2fj3H5r6/8OM34il+1wZIDaA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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