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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f788fd35247009d578c9ce11848ad9f14974dd61f181add6916d11b2e9abb64' 
  AND token = 'PydefmeKVk1JsKwUzkxN5vOL3QewU7FxxYlNBqtBV4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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