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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc3f70ac3547274c466c6443b1ac2beae5602f8c5e36f3d8cc997cea201e1ee4' 
  AND token = 'cAmpyHKLn4OMemF7yv027qmkNp3EMhIzh8U3JxacHH4=' 
  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"
    }
  }
}