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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1821936dcfc4466dec33bf9b6d2bc79a9ee01688040ef4f8c353219455658c5' 
  AND token = 'l2D1H1LeDw7433V16hXc3IC57gy8/fEnAH0FpIN+i2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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