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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7def861182aa0ada3a9682177df89925fb56cc0c2e739d09a6b9d2fcb3b928e' 
  AND token = 'i9f634wIbKaUqRId74s6kBXGF1o+WcP8Wa4+1oBgbhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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