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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3b0623f3e0068ebc9e589cff5ea04c820f51777db94e5400b396efc38530ab3' 
  AND token = '8p2/co90C5bQ8iTTP9XuaiVdAyUI/Y9ucy/JqIXf82s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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