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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eca11e6cd3fe00e0c890a6e3ee9b20f82c5271edc431791e5591b127a49999a3' 
  AND token = 'dHsa959VDVeyij28T7k832nMozZrSDjFE855LZoP6X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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