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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e91e6aee50a2cf7e634f03cc455b3d4a49a76e5ee70f5230b043120ede13f2' 
  AND token = 'htSC/FFR4CG1OXrV95WwagGCd8K3x/GFQ6GMOV4JE5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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