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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c218db725a5b417b40a50caf65cf322ca9474ed7f7cefaff6ca579ec88e2a1' 
  AND token = 'LF7S/nXGosal41+7+CaW0ys4gBzKrkZT73o2N8jsIhE=' 
  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"
    }
  }
}