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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33510ce2d473802e5124a1eb96a7b980afcca898ace0fa0351b9268d4d5c1ed' 
  AND token = 'v+qeR/zF0gXaTHg4AFmLshXeREeHCXVisV2ljNgjxZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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