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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f128f9d697a472459115f65b88f4eb3fcf2b2634a6bacdbe64b598043d9e5d3' 
  AND token = '2fTXCyeExMZI0ODJ70D1dqGBv1Se/1z7az0zrc/PUfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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