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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2a6eb23f16f6bab7cce101078d06aecf111f3e85c6842a7eb5f3177eb682714' 
  AND token = '1D7w4V771Tq7E9aKVqT9cwzBlDt535hbzSnGrY+vjg8=' 
  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"
    }
  }
}