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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b48d1b03e2b4d89c0336df756666bd4d87cfadeb476a7e6adf48e5c5b2403c27' 
  AND token = '8fT9LpPe6GDx0REPgSRib1mZr2Av3lRPVSGbI+52zA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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