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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a950d0b65e46f1dd1e16223cb7072db2f212906f0012eab81bb5fbff5f5e8a3' 
  AND token = 'JxSpZS44C0agCJ+d4TnG9QaY0MW/RCikg5GSxFCVHds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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