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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '679d08d4bcf4fa14176690cdea0bdd32990d386ee6c4e9fa5e77c56eeb4123b5' 
  AND token = 'xBPwaR4iny3snjw7ng6z8TjN/BYYXTdryxk4uOfm85A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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